Update Xcode parsing lib

[lpusok]

Changes

• Updated iOS Scanner to use absolute paths everywhere, in preparation of the updated xcodeproj package. This required updating a few Cocoapods parsing Ruby scripts.
• Fixed/worked around a problem that only top-level (Pod target) projects were parsed from Podfiles. Now using the first project, disregarding which target is it in.

# Uncomment the next line to define a global platform for your project
# platform :ios, '9.0'

target 'Sample' do
  # Comment the next line if you don't want to use dynamic frameworks
  use_frameworks!
  project 'Sample/Sample.xcodeproj'
  # Pods for Sample
  pod 'Alamofire', '~> 5.5'
end

• Added a container interface which is implemented by projectContainer (.xcodeproj), workspaceContainer (.xcworkspace); and podWorkpace (an .xcworkspace where the actual workspace is not present, only the project files).

Resolves: https://bitrise.atlassian.net/browse/STEP-1804

[lpusok]

Fixed/worked around a problem that only top-level (Pod target) projects were parsed from Podfiles. Now using the first project, disregarding which target is it in. For example, the project is under Sample target here. (It would be Pod if it was before the Sample target declaration.)

# Uncomment the next line to define a global platform for your project
# platform :ios, '9.0'

target 'Sample' do
  # Comment the next line if you don't want to use dynamic frameworks
  use_frameworks!
  project 'Sample/Sample.xcodeproj'
  # Pods for Sample
  pod 'Alamofire', '~> 5.5'
end